Gastric glands are specialized structures located in the lining of the stomach. They play a crucial role in digestion by secreting gastric juice, which contains enzymes and hydrochloric acid. These components help break down food and kill harmful bacteria, facilitating the digestive process. There are three main types of cells in gastric glands: parietal cells, which produce hydrochloric acid; chief cells, which secrete digestive enzymes like pepsin; and mucous cells, which produce mucus to protect the stomach lining from acid damage. Together, these cells ensure efficient digestion and maintain the health of the stomach.